move back and forth

Từ điển WordNet v3.1 - WordNet Dictionary

verb

move in one direction and then into the opposite direction
• Hypernyms:
move
• Hyponyms:
rock, sway, shake, swing, flicker,
waver, flitter, flutter, quiver
• Verb Frames:
- Something ----s
- Somebody ----s
- Somebody ----s PP