Meaning

noun an erratic deflection from an intended course

verb be wide open

verb deviate erratically from a set course

originUnknown, first attested in the mid-16th century. Perhaps related to yar (“quick, agile”), or alternatively from Old Norse jaga (“to chase, drive, move back and forth”), from Middle Low German jagen (“to hunt, chase, pursue”), from Old Saxon *jagōn, from Proto-West Germanic *jagōn, from Proto-Germanic *jakkōną (“to hunt”).

Etymology from Wiktionary, CC BY-SA 3.0