[muck in] {v.} Share a duty or workload.

[mucker] {n.} Mate, pal.

[mud] See: [NAME IS MUD], [STICK-IN-THE-MUD].

[mud in your eye] {n. phr.}, {informal} A cheering exclamation when […]

[mufti] {n.} Civilian dress worn by someone who normally wears a […]

[mug] {n.} 1. Face. 2. A gullible or easily swindled person.

[mug shot] {n. phr.} A police photograph showing the arrested person's […]

[Muhammad] See: [IF THE HILL WON'T COME TO MUHAMMAD, THEN MUHAMMAD […]

[mull over] {v. phr.} To consider; think over. * /He mulled […]

[mum is the word] You must keep the secret; keep silent; […]