slip-up

The word 'slip-up' is a phrasal verb nominalization, a common pattern in English for forming compound nouns. The core verb 'slip' evolved from a physical sense of losing footing or gliding unintentionally to a metaphorical sense of making a minor error or lapse in judgment. The addition of the particle 'up' follows the Germanic separable verb tradition, intensifying the action to denote a completed mistake or blunder. This compound elegantly captures the concept of a small, often inadvertent failure through the literal image of a misstep.

Structure: slip (to slide/make a mistake) + up (completive particle) 'Slip' is from Old English slipan (to glide, slide, move smoothly), of Germanic origin. In this compound, it carries the sense of making an error. 'Up' is from Old English up, upp, of Germanic origin, used here as an adverbial particle to indicate the completion or result of the action.