(idiomatic) To be particularly, especially uncannily, observant; a perceived ability to see in all directions at once.

(historical) The British and Allied fighter pilots during the Battle of Britain in World War II.

An injection of a drug into the arm, whether for medical or recreational purposes. / (by extension) A stimulus; a boost in energy, morale, or well-being.

(idiomatic, informal) To do what was promised.

(of a projectile) To fail to hit the target. / (figuratively) To fail to achieve the intended result.

(UK, Australia) Cease to boil when heat is no longer applied. / (idiomatic, UK, Australia) To lose interest; to pall. / (idiomatic, UK, Australia) To become of diminished intensity or urgency.

(idiomatic) behaving violently or rioting

Of a projectile: missing the target. / (idiomatic) (Very) inaccurate.

Alternative spelling of by the by

(idiomatic) To chinwag; to talk idly.