X-ray eye, custodianship, custody, eye, gimlet eye, guard, guardedness, guardianship, invigilation, keen eye, lookout, monitoring, observance, peeled eye, penetrating eye, proctoring, prudence, qui vive, scrutiny, sharp eye, stewardship, surveillance, tab, vigil, vigilance, wariness, watch, watch and ward, watchful eye, watchfulness, watching, weather eye