IPA: /ˈrɪɡlə/
KK: /ˈrɪɡlər/
A person or creature that moves in a twisting or squirming manner.
The wriggler slipped through the grass, making it hard to catch.
Wriggler → The word is derived from the verb 'wriggle' (of uncertain origin, possibly from Middle English 'wriglen', meaning to twist or squirm) combined with the suffix '-er' (meaning a person who). A wriggler is a person or creature that twists or squirms.
Think of someone or something that 'twists' or 'squirms' — that's what a wriggler does, and the '-er' just means a person or thing that performs that action.