(adv.) In a perpendicular manner; vertically.

T square absolute absolutely accurately all-embracing all-encompassing all-out all-pervading answer aplomb appraise appreciate assay assess at right angles azimuth circle bang bar barricade batten batten down bob bolt born bottom broad-based button button up calculate calibrate caliper cast the lead check a parameter choke choke off clap clean clear clear up close close up come alive completely comprehensive compute congenital constrict consummate contain contract cover crack dead debug decipher decode deep-dyed definitely delve delve into descry dial dig into directly discern disentangle divide divine do dope dope out downright dyed-in-the-wool egregious entirely estimate evaluate even exactly exhaustive explain explore expressly faithfully fasten fathom figure out find out find the answer find the solution flush fold fold up full fully gauge get get right go into graduate guess guess right have it hit it in all respects in every respect indagate intensive interpret investigate ipsissimis verbis irretrievably irrevocably just kerplunk key latch lead literally literatim lock lock out lock up look into make a sounding make out measure mensurate mete meter normal occlude omnibus omnipresent open the lock orthodiagonal orthogonal out-and-out outright pace padlock peer into penetrate perceive perfect perfectly perpendicular perpendicularly pervasive pierce plain plop plumb bob plumb line plumb rule plumb the depths plumb-line plummet plump plunging plunk point-blank poke into positively precipitous precisely prize probe pry into psych psych out pure puzzle out quantify quantize quite radical rate ravel ravel out regular resolve riddle right right angle right-angle right-angled right-angular rigidly rigorously sandbag seal seal off seal up search into secure see see daylight see into see the light see through set set square sheer sheerly shut shut the door shut up sift sinker size size up slam slap sling the lead smack smack-dab snap solve sort out sound span spang spot square squarely squeeze shut stark steep step straight straight-up straight-up-and-down strangle strictly survey sweeping take a reading take soundings thorough thoroughgoing thoroughly through-and-through to the letter total triangulate try square ubiquitous unconditional undeviatingly undo unerringly universal unlock