The compound adjective "well-off" emerged in the 18th century, combining two common Germanic adverbs. The logic is spatial and metaphorical: to be "well off" originally meant to be well away from or removed from hardship, poverty, or trouble. The "well" component signifies a good or satisfactory condition, while "off" implies a state of separation or distance from negative circumstances. Over time, this literal sense of being fortunately distanced from misfortune narrowed to its predominant modern meaning of being financially secure or prosperous, a state viewed as inherently distanced from want.

Structure: well (in a good state) + off (away, from) - well: From Old English wel, meaning "in a good way, properly, satisfactorily." It is of Germanic origin. - off: From Old English of, meaning "away, away from." It is of Germanic origin.