1. Short underpants for women or children (usually used in the plural)
   - pantie, panty, scanty

1. Get involved, so as to alter or hinder an action, or through force or threat of force
   - intervene, interfere, interpose 
2. Act as a substitute
   - substitute, deputize, deputise [Brit]

Derived forms: steps in, stepped in, step-ins, stepping in

Type of: interact, pants [Brit], replace, supercede, supersede, supervene upon, supplant, underdacks [Austral], underdaks [Austral], underpants, undershorts [N. Amer]

• flea-bitten
• fleabag
• fleabane
• fleapit
• fleawort
• flecainide
• fleck
• flecked
• flection
• fledge
• fledged
• fledgeless
• fledgeling
• fledgling
• flee
• fleece
• fleeceable
• fleecer
• fleecy
• fleer
• fleet
• fleet admiral
• fleet ballistic missile submarine
• Fleet Street
• fleeting