(modal, auxiliary verb) Contraction of had better.

(physics) The radiation of beta particles as a result of radioactive decay.

(intransitive, literally) To improve. / (intransitive, idiomatic) To recover from illness or other incapacitation.

Alternative spelling of beta-carotene

(biochemistry) A plant pigment that is an isomer of carotene, found in dark green and dark yellow vegetables and fruits and important in the diet as a precursor of vitamin A.

(rail transport, road transport) A measure of reliability that expresses the average distance travelled by a type of lorry, bus, rolling stock, etc, before preventative or reparative maintenance is required.

(idiomatic) Between undesirable alternatives.

It is often wise to refrain from seemingly brave speech or action.

Alternative spelling of better off

It is preferable to be cautious in one's choices and actions than to act recklessly and suffer afterwards.