(dated) atomic theory

(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.

(idiomatic, informal) To do what was promised.

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

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) behaving violently or rioting

(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.

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

Alternative spelling of by the by