(intelligence) To retrace events so as to determine where an operation went wrong and who was responsible. / (diplomacy) To back down; to adopt a position where one is more willing to compromise.

(idiomatic) Ready if needed, in reserve, prepared, available for use whenever it might be advantageous.

Cinnyris jugularis, a bird of the sunbird family Nectariniidae

Poecile rufescens, a small bird of the tit family Paridae

Parus monticolus, a small bird of the tit family Paridae

Larus schistisagus, a large gull.

To support something or someone unsuccessful.

plural of back-door pilot

(film, television) A film, miniseries, or episode that serves as a proof of concept for a new full television series, but may be broadcast on its own even if the full series does not come to fruition.

Lanius excubitoroides, a species of bird in the family Laniidae.