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

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

[muscle in on] {v. phr.} To intrude; penetrate; force oneself into […]

[nail down] {v. phr.}, {informal} To make certain; make sure; settle. […]

[nark] {n.} {v.} 1. As a verb or noun; spy or […]

[narrow down] {v. phr.} To limit within very strict margins. * […]

[never mind] {v. phr.} Don't trouble about it; don't worry about […]

[never say die] {v. phr.} Don't quit; don't be discouraged. * […]

[nick] {v.} 1. Steal. 2. Police Station or prison. 3. To […]

[nip in the bud] {v. phr.} To check at the outset; […]