Becher's Brook /bēˈcherz brŭk/

1. A notoriously difficult jump in the Grand National steeplechase
2. A particularly difficult or critical obstacle, problem or possible stumbling-block

• open mind
• open-minded
• open-mindedly
• open-mindedness
• open minds
• open-mouthed
• openness
• opennesses
• open note
• open notes
• open order
• open orders
• open out
• open-plan
• open-plan house
• open-plan houses
• open primaries
• open primary
• open prison
• open prisons
• open question
• open questions
• open-reel
• opens
• open sandwich