underkill

un·der·kill

U0052900 (ŭn′dər-kĭl′)n.1. Insufficient force to defeat an enemy.2. An insufficient amount of what is necessary or appropriate for a purpose: regulatory underkill.
un′der·kill′ v.

underkill

(ˈʌndəˌkɪl) n (Military) informal US a lesser force than is needed to defeat an enemy