I. verb — [no obj.] (usu. as adj. beetling) 1. (of a rock or a person’s eyebrows) project or overhang. • his eyebrows beetled with irritation.
II. adjective — [ attrib.] 1. (of a person’s eyebrows) shaggy and projecting • thick beetle brows.
III. derivatives beetle-browed /ˈbiːtlbraʊd / adjective
– origin mid 16th cent. (as an adjective): back-formation from beetle-browed, first recorded in Middle English. The verb was apparently used as a nonce word by Shakespeare and was later adopted by other writers.