Difference between Slow Up and Slacken

SLOW UP vs SLACKEN: NOUN

A spongy, semivitrifled substance which miners or smelters mix with the ores of metals to prevent their fusion.
The slags or cinder from previous fusions, used in smelting operations to mix with natural ores and to retard fusion of the ores until reduction shall have proceeded to the desired point.

To become less active; fall off: as, trade slackened; the demand slackens; prices slacken
To become remiss or neglectful, as of duty.
To make slack or slacker.
To abate; moderate; lessen; diminish the intensity, severity, rate, etc., of; hence, to mitigate; assuage; relieve: as, to slacken one's pace; to slacken cares.
To be or become remiss in or neglectful of; remit; relax: as, to slacken labor or exertion.
To become slack.
(transitive; intransitive verb) To make or become less vigorous, intense, or severe; ease.
(transitive; intransitive verb) To make or become less tense, taut, or firm; loosen.
(transitive; intransitive verb) To make or become slower; slow down.

Slowback, Speedless, Foreslow, Ease up, Tardation, Sloomy, Allargando, Larghissimo, Lentitude, Slow down, Retard, Decelerate, Slacken, Slack, Slow

Letup, Relax, Diminish, Loosen, Abate, Waver, Relent, Weaken, Wane, Slack up, Slow up, Slow down, Remit, Slack, Slow

Slowback, Speedless, Foreslow, Ease up, Tardation, Sloomy, Allargando, Larghissimo, Lentitude, Slow down, Retard, Decelerate, Slacken, Slack, Slow

Detach, Lessen, Decrease, Loose, Letup, Relax, Diminish, Loosen, Abate, Weaken, Slow up, Slow down, Remit, Slack, Slow

Through the course of isotonic cardiac workouts, a spasm may likely slow up the drive important for contraction.
Starting to slow up and do a less charters this time of year, but we have still been doing some fishing.
If it is about the engine, then slow up your speed and check if something happens.
You can slow up the process of the pearls absorbing acid from your skin.
Or, you may say that this business of marking books is going to slow up your reading.
Tags where the main door, arcane attribute requirement is fairly slow up to create an attack.
Thus they leap over obstacles that would slow up a human being, too thick!
The thought is the idea is if you clean up the edges, you helpfully arrest or slow up the degenerative process.
The horses continually showed a disposition to slow up.
At best, too many cooks slow up a broth.