Difference between Keep Back and Restrain

KEEP BACK vs RESTRAIN: VERB

To hold back or keep in check; control.
To prevent (a person or group) from doing something or acting in a certain way.
To withhold; to forbear.
To limit; to confine; to restrict.
To hinder from unlimited enjoiment; to abridge.
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.
To draw back toghtly, as a rein.
To hold, fasten, or secure so as to prevent or limit movement.

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.
Restrict (someone or something) so as to make free movement difficult
Prevent the action or expression of
Keep under control
Keep in check
Prevent (someone or something) from doing something
To close within bounds, or otherwise limit or deprive of free movement

Do without, Get hold of, Keep from, Take hold, Keep at, Keep apart, Keep down, Concentrate on, Dam up, Hold back, Withhold, Restrain, Hold, Retain, Keep

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

Press down, Do without, Get hold of, Keep from, Take hold, Keep at, Keep apart, Keep down, Concentrate on, Dam up, Withhold, Restrain, Hold, Retain, Keep

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

Harrisch managed to keep back from the gaping hole, holding his arms out for balance.
King Ethelred earned his nickname for failing to keep back invading Vikings.
Landry: It will hold that whole race black if you keep back.
There is coughing enough to keep back several rebel regiments.
Does a belief in immortality keep back their tears?
Your local library may keep back copies of newspapers.
People will continue to keep back till Allah will put them at the back.
Repeat the previous Keep your head downto improve balance and Remember to keep back foot on the follow through.
Stand back: Trains overhang the tracks by about 3 feet, so keep back.
Keep back from the wi thess stand; causes witness to keep voice up.