square / quadratic / straightforward

square / patch (of land) / four of a kind / frame, framework

rack of lamb

square metre, square meter (standard unit of area)

(figuratively) territory, turf, domain, province

(mathematics) square number

(mathematics) square number, perfect square

(of a bed) with hospital corners / (of a haircut) in which the hair is typically cut straight around the head at about jaw-level

to square (multiply by itself)

(hip hop culture, slang) expression of affirmation or agreement, similar to OK