(idiomatic) To figure something out; to deduce or discern something.

plural of two-up-two-down

(UK) A traditional house with two rooms upstairs and two rooms downstairs.

Third-person singular simple present indicative form of put two and two together

present participle of put two and two together

having exactly two arms

(Cockney rhyming slang) A state (of upset, worry).

(mathematics) A measure of length given by "the square root of the squares." Denoted by ||·||₂, the two-norm of a vector ⃑v= is ||⃑v||₂=√. The two norm of an m⨯m matrix A is defined by max _(⃑v≠⃑0)|/} where ⃑v is an m-dimensional vector that is not the zero vector.

Existing in two dimensions. / Not creating the illusion of depth; lacking detail or believability.

The cardinal number immediately following eighty-one and preceding eighty-three.