arrect /a-rektˈ/

1. (of an animal's ears) upright, pricked up
2. On the alert

• grumble
• grumbled
• grumbler
• grumblers
• grumbles
• Grumbletonian
• grumblier
• grumbliest
• grumbling
• grumbling appendices
• grumbling appendix
• grumbling appendixes
• grumblingly
• grumblings
• grumbly
• grume
• grumes
• grumly
• grummer
• grummest
• grummet
• grummet-hole
• grummet-holes
• grummets
• grumness