up in arms (?.)

• against the grain
• against the tide
• against the wind
• all ready
• all set
• armed
• armed and ready
• at cross-purposes
• at daggers
• at daggers drawn
• at feud
• at issue
• at loggerheads
• at odds
• at square
• at strife
• at variance
• at war
• at war with
• athwart
• booted and spurred
• briefed
• coached
• cocked
• complaining
• contra
• contrariwise
• counter
• cross
• disputatious
• disputing
• dissentient
• dissenting
• equipped
• eyeball-to-eyeball
• familiarized
• fractious
• good and ready
• groomed
• in arms
• in battle array
• in confrontation
• in hostile array
• in opposition
• in readiness
• in the saddle
• informed
• loaded
• loaded for bear
• mature
• mobilized
• noncooperative
• objecting
• obstructive
• on the barricades
• on the mark
• planned
• prearranged
• prepared
• prepared and ready
• prepped
• primed
• proof against
• protesting
• provided
• psyched up
• ready
• ready for anything
• rebellious
• recalcitrant
• refractory
• reluctant
• renitent
• repellent
• resistant
• resisting
• resistive
• retardant
• retardative
• ripe
• set
• uncooperative
• unsubmissive
• unyielding
• vigilant
• well-prepared
• with crossed bayonets
• withstanding