pit
be the pits be extremely bad or the worst of its kind. informal
☞ Pits is a mid-20th-century informal term for 'armpits' and has connotations of body odour; from this it came to refer generally to something regarded as bad or unpleasant.
dig a pit for: seedig.
the pit of your (or the) stomach an ill-defined region of the lower abdomen seen as the seat of strong feelings, especially anxiety.
pit your wits against: seewit.