IPA: /ˈswæɡərɪŋli/
KK: /ˈswæɡərɪŋli/
In a way that shows confidence and arrogance, often walking or behaving in a proud manner.
He walked swaggeringly into the room, drawing everyone's attention.
Swaggeringly → It is formed from "swagger" (originating from the early 16th century, possibly from a Scandinavian source, meaning to sway or walk with a bold, confident manner) and "-ingly" (a suffix used to form adverbs indicating the manner of an action). The word "swaggeringly" means to walk or behave in a bold, confident manner.
Think of someone walking with a bold confidence — that's what 'swaggeringly' describes, as it comes from 'swagger' which means to sway or walk boldly.