随手 suíshǒu conveniently
conveniently; without extra trouble; while doing it; in passing
How to remember 随手: 随 follow + 手 hand = conveniently.
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How it is used
- Doing something in passing, without extra effort - 随手关门 (suíshǒu guān mén) close the door on your way (as you go); 随手拍的照片 (suíshǒu pāi de zhàopiàn) a casual snapshot.
- 'While your hand is at it' - a small action folded into another. Common in polite reminders (随手关灯, turn off the light when you leave).