(grammar) a clause that is the subject of a sentence

Likely to be affected by or to experience something. / Conditional upon something; used with to. / Placed or situated under; lying below, or in a lower situation.

(grammar) In a clause: the word or word group (usually a noun phrase) about whom the statement is made. In active clauses with verbs denoting an action, the subject and the actor are usually the same.

(transitive, construed with to) To cause (someone or something) to undergo a particular experience, especially one that is unpleasant or unwanted.

(transitive, intransitive, physics) To change state from a solid to a gas without passing through the liquid state. / (transitive, archaic) To purify or refine a substance through such a change of state.

(chemistry) A product obtained by sublimation.

Formed, as in opinions, based upon a person's feelings or intuition, not upon observation or reasoning; coming more from within the observer than from observations of the external environment.

(hydrology, oceanology) A river-like current on the seabed.

Existing, relating to, or made for use beneath the sea. / Hidden or undisclosed. / (baseball) Of a pitch, thrown with the hand lower than the elbow.

A boat that can go underwater. / A kind of sandwich made in a long loaf of bread. / (baseball) Pitch delivered with an underhand motion. / Any submarine plant or animal.