protagonist /prə- or prō-tagˈə-nist/

1. Orig the chief actor, character or combatant
2. Now often applied to any (or in pl, all) of the main personages or participants in a story or event
3. (loosely) a champion or advocate

• lockman
• lockmen
• locknut
• locknuts
• lock on
• lock on to
• lock out
• lockout
• lockouts
• lockpick
• lockpicks
• lockram
• lockrams
• locks
• locksman
• locksmen
• locksmith
• locksmiths
• lockstep
• locksteps
• lockstitch
• lockstitches
• lock, stock and barrel
• lock up
• lock-up