keep in sight (?.)

• and listen
• be vigilant
• be watchful
• bear in mind
• eye
• eyeball
• follow
• gaze at
• have a looksee
• have regard for
• hold in mind
• hold in view
• keep alert
• keep in mind
• keep in view
• keep under observation
• keep vigil
• keep watch
• look
• look about one
• look after
• look at
• look lively
• look on
• look out
• look sharp
• look upon
• never nod
• observe
• qui vive
• reckon with
• reconnoiter
• regard
• scout
• spy upon
• stop
• take account of
• take cognizance of
• take heed of
• take into account
• take into consideration
• take note of
• take notice of
• view
• watch
• watch out