From shrink + away.
shrink away (third-person singular simple present shrinks away, present participle shrinking away, simple past shrank away or shrunk away, past participle shrunk away or shrunken away)
- to draw back in fear, cringe, back down
- 1912, Stratemeyer Syndicate, Baseball Joe on the School Nine Chapter 1
- But Tommy was bashful, and the attention he had thus drawn upon himself made him blush. He was a timid lad and he shrank away now, evidently fearing Shell.