bog
n.
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.
v.
"to sink (something or someone) in a bog," c.1600, from bog, n.. Intransitive use from c.1800. Related: Bogged; bogging.