This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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v. Simple past tense and past participle of drill.

adj. trained in a skill by repetitious practice

"I took Spanish from elementary school on (grew up in New Mexico and Texas) and verb tenses were drilled from the start."

breast drill    traverse drill    drill plough   

drilled    drilling    drills   

take    learn    read    study    baboon    training    grooming    preparation    train    prepare   

half-round drill    forked drill    vertical drill    dental drill    swiss drill    percussion-drill    finishing-drill    string-drill    double drill    watchmakers’ drill   

drill bit    twist drill    drill down    drill press   

drilling   

drill sergeant   

discipline    entice    decoy    trickle    rill    sow    exercise    training    pierce    train   

Bastille    Belleville    Bill    Brazil    Brill    Gil    Gill    Hill    Jill    Lil   

exercise    train    equipment    test    weapon    combat    mission    research    maintenance    instruction