Argus CIA man Charley abhor abjure advance guard airhead airplane spotter ancestor announcer antecedent avant-garde barrack battle line be vigilant be watchful beachhead bellwether bridgehead brush aside buccinator bug bushwhacker case chaff check out chuck chuck out cloak-and-dagger operative contemn contradict counterintelligence agent counterspy course cover cut at decline deny deride despise dig at dig out dig up disapprove discard disclaim discount discover disdain dismiss disown disregard do double agent dump on espionage agent examine except exclude explore explorer eye eyeball farthest outpost ferret out find fire patrolman fire warden fireguard first line fish out fleer flout follow forebear forefront foregoer forerunner forswear forward observer front front line front rank front runner front-runner frontiersman fugleman gaze at gibe go over groundbreaker grub up guide harbinger have a looksee herald hold in derision hold in view hunt out ignore innovator inside man inspect intelligence agent investigate jab jab at jape jeer keep in sight keep in view keep under observation laugh at laugh to scorn lead runner leader line locate look after look at look on look over look upon lookout lookout man lout make a reconnaissance measure messenger military-intelligence man mock naval-intelligence man night watchman observe operative outguard outpost overpass pass by pass over pass through pass up pathfinder patrol patroller patrolman peep perambulate peregrinate pererrate picket pioneer play the spy ply point pooh pooh-pooh precedent precursor predecessor probe pry out push aside put down put under surveillance quiz rail at railhead rally range range over rank out razz rebuff recant reconnoiter reconnoiterer refuse refuse to consider regard reject renounce repel repudiate repulse research revile ridicule root out roundsman scoff scoff at scorn scorn to receive scour scour the country scout out search out secret agent sentinel sentry set at defiance shove away slam slap at slight slight over sneer sneer at spearhead spit upon spotter spurn spy spy out spy upon spy-catcher stake out stormy petrel study survey sweep swipe taunt throw away throw out track trailblazer trailbreaker transit travel over travel through traverse treat with contempt turn away turn out twit uncover undercover man van vanguard vaunt-courier vedette view voortrekker voyage waive watch watcher watchkeeper watchman