Difference between Constrain and Restrain

CONSTRAIN vs RESTRAIN: VERB

To bring into a narrow compass; to compress.
To hold back by force; to restrain; to repress.
To compel; to force; to necessitate; to oblige.
To violate; to ravish.
To produce in such a manner as to give an unnatural effect.
To keep within certain limits; confine or limit.
To inhibit or restrain; hold back.
To produce in a forced or inhibited manner.
To compel by physical, moral, or circumstantial force; oblige.
To secure by bonds; to chain; to bond or confine; to hold tightly; to constringe.

To hold back or keep in check; control.
To prevent (a person or group) from doing something or acting in a certain way.
To hold, fasten, or secure so as to prevent or limit movement.
To withhold; to forbear.
To limit; to confine; to restrict.
To hinder from unlimited enjoiment; to abridge.
To draw back toghtly, as a rein.
To draw back again; to hold back from acting, proceeding, or advancing, either by physical or moral force, or by any interposing obstacle; to repress or suppress; to keep down; to curb.

In mech.: To prevent the occurrence of (motion), except in a particular direction: as, the relative motions of the parts of any machine are always constrained.
To force.
To check; repress; hinder; deter.
Compel to behave in a certain way
To close within bounds, or otherwise limit or deprive of free movement
Severely restrict in scope or extent
To confine or hold by force; restrain from escape or action; repress or compress; bind.
Hence To urge with irresistible power, or with a force sufficient to produce the effect; compel; necessitate; oblige.
In general, to exert force, physical or moral, upon, either in urging to action or in restraining from it; press; urge; drive; restrain.
To prevent the operation of the motion of (a material point or body), except in a particular and definite manner: as, to constrain a part of a mechanism.

To draw tight; strain.
To hold back; hold in; check; confine; hold from action or motion, either by physical or moral force, or by any interposing obstacle; hence, to repress or suppress: as, to restrain a horse by a bridle; to restrain men from crimes and trespasses by laws; to restrain, laughter.
To abridge; restrict; hinder from liberty of action.
To limit; confine; restrict in definition.
To withhold; forbear.
To forbid; prohibit.
Synonyms Restrain, Repress, Restrict; stop, withhold, curb, bridle, coerce. Restrain and repress are general words for holding or pressing back; restrict applies to holding back to a more definite degree: as, to restrain one's appetite; to restrict one's self in food or to a certain diet. That which we restrain we keep within limits; that which we restrict we keep within certain definite limits; that which we repress we try to put out of existence.
Keep in check
Keep under control
Prevent the action or expression of
Prevent (someone or something) from doing something
Restrict (someone or something) so as to make free movement difficult
To close within bounds, or otherwise limit or deprive of free movement

Constrict, Hinder, Circumscribe, Inhibit, Hamper, Undermine, Impede, Restrict, Curtail, Tighten up, Cumber, Stiffen, Tighten, Encumber, Restrain

Subdue, Keep back, Hold back, Cumber, Bound, Throttle, Hold, Trammel, Encumber, Limit, Keep, Restrict, Confine, Intimidate, Constrain

Impair, Constrict, Hinder, Circumscribe, Inhibit, Hamper, Undermine, Impede, Restrict, Curtail, Tighten up, Stiffen, Tighten, Encumber, Restrain

Curtail, Suppress, Rein, Subdue, Keep back, Bound, Throttle, Hold, Encumber, Limit, Keep, Restrict, Confine, Intimidate, Constrain

How do international capital markets constrain policy space?
UNIQUE constrain, because NULL is not a value.
Increased frequency of security patches can constrain operations.
Are historical records sufficient to constrain ENSO simulations?
United States to constrain China in the region.
The PCD TF does not further constrain thifield.
Did being a poet help or constrain you?
It may be a constrain in improving something that may be a constrain.
You can constrain the part instance to be fixed in space, or you can constrain it to follow selected nodes.
To constrain or not to constrain, and other stories of intensive upper extremity training for children with unilateral cerebral palsy.