not know one's arse from one's elbow

not know one's arse from one's elbow be totally ignorant or incompetent 完全无知; 绝对无能。

• outporter
• diazoketones
• blue-sky man
• sheet line
• crisscross
• backsighted
• Joe Doakes
• flood sb↔out
• Bizen ware
• Dallis grass
• negative rake
• outlearned或 -learnt
• scratch
• subtilising
• inexpertises
• dory skiff
• vivas
• continented
• unfolders
• telephonies
• SSB
• wavemark
• mergers
• lilled
• let something lie
• expelling
• magnetoelastic
• captive market
• polyphemus moth
• direct quenching
• get on with it!
• money-washing
• Tuan
• phrase structures
• fowl plague
• reconcentrates
• Centropomidae
• Chondrophora
• plaster saints
• MSPHED
• herpetol
• I band
• adroitly
• coalescer
• bomb blanket
• neurocomputer
• expostulating
• private brands
• gillers
• skullduggeries
• induced mutation
• plough into
• put sth in order
• boresafe fuse
• d.h.g.
• catch-as-catch-can
• ACE
• wear one's years (或 age) well
• synonymousness
• fabliaux
• enforced deportation
• pamperest
• intrusive mountain
• loss cone
• microtubular
• relative frequencies
• be in the cart
• falx inguinales
• move with the crowd
• wire edge
• supergeostrophic wind
• incenter
• direct objects
• dextrocularity
• be out in one's reckoning
• improvisatorially
• dewlapping
• Cymbellaceae
• satellite vehicle
• drawing-room
• bring sb to book
• make an end of
• -oidal
• Chinamen
• Islamising
• leave out of account (或 consideration, reckoning)
• advt
• Fry, Roger (Eliot)
• osprey
• inner space
• the upper hands
• emphysema
• balanced wire circuit
• BAEd.
• presenter
• in one's pelt
• antiallergic
• mediatrices
• puzzle sth↔out
• northwest by north