The difference between Shrink and Shrink back

When used as verbs, shrink means to cause to become smaller, whereas shrink back means to back away or retreat.

Shrink is also noun with the meaning: shrinkage.

check bellow for the other definitions of Shrink and Shrink back

Shrink as a verb (transitive):

To cause to become smaller.

Examples:

"The dryer shrank my sweater."
Shrink as a verb (intransitive):

To become smaller; to contract.

Examples:

"This garment will shrink when wet."
Shrink as a verb (intransitive):

To cower or flinch.

Examples:

"Molly shrank away from the blows of the whip."
Shrink as a verb (transitive):

To draw back; to withdraw.
Shrink as a verb (intransitive, figuratively):

To withdraw or retire, as from danger.
Shrink as a verb (intransitive):

To move back or away, especially because of fear or disgust.

Shrink as a noun:

Shrinkage; contraction; recoil.
Shrink as a noun (slang, sometimes, pejorative):

A psychiatrist or psychotherapist.

Examples:

"You need to see a shrink."

"My shrink said that he was an enabler, bad for me."

"synonyms: head-shrinker"
Shrink as a noun (uncountable, business):

Loss of inventory, for example due to shoplifting or not selling items before their expiration date.