The part of the framing of a railway car or truck by which an axle box is held laterally, and in which it may move vertically.

(archaic) The vanguard or advanced body of an army.

(idiomatic, cricket) (For a new batsman, with help from the umpire) to mark a point on the popping crease in front of his wicket so that he knows where it is behind him; to guard.

A thin loop surrounding the trigger of a weapon to keep it from accidental discharge.

of, or relating to a rearguard / of, or relating to resistance in politics etc

A physical barrier to protect something from unwanted contact, especially a shield to prevent accidental tripping of an emergency shutdown or power switch.

A mesh screen placed in front of a fire to prevent sparks escaping.

The organisation or officer enforcing maritime law and policing the seas within territorial waters.

Not vigilant; unprepared; inattentive. / Unexpectedly or by surprise.

A decommissioned aircraft, artillery piece, or tank, displayed near the entrance to an airport or military base.