1 (delgado) thin; skinny (familiar) Oye, flaco, por donde ...
años flacos (Latinoamérica) lean years; ponerse flaco (Latinoamérica) to get thin
2 (débil) weak; feeble; [+memoria] bad; short; (Latinoamérica) [+tierra] barren su punto flaco his weak point; his weakness