bog (n.) Look up bog at
c. 1500, from Gaelic and Irish bogach "bog," from adjective bog "soft, moist," from PIE *bhugh-, from root *bheugh- "to bend" (see bow (v.)). Bog-trotter applied to the wild Irish from 1670s.
bog (v.) Look up bog at
"to sink (something or someone) in a bog," c. 1600, from bog (n.). Intransitive use from c. 1800. Related: Bogged; bogging.