be flogging a dead horse

be flogging a dead horse spokento be wasting time or effort by trying to do something that is impossible浪费时间，徒劳，白费劲

• quadrics
• antlion
• overslips
• wash ... down
• acetostearin
• Dermestidae
• the world of dreams
• daybeacon
• mopiest
• shot-firer
• sym-tetrabromoethane
• league table
• bellbinds
• hit-and-runner
• bridecakes
• hobbing machine
• no offence
• TRBF
• de-excite
• flower people
• laboursome
• solid-fuel
• diaspore
• sportily
• OAS
• trumpet honeysuckles
• Alcaic
• deny oneself
• Jewishness
• ONRS
• sell candidate like soap
• electroshock
• be on sb's side
• technospheres
• emasculatory
• swads
• leitmotiv
• commendation
• double jack
• quarrying machine
• the nigger in the fence
• annual epact
• peregrinate
• concerts
• flounce out
• metavauxite
• gaseousnesses
• tint
• floating rule
• do number one
• dismal
• caeno-
• sibbed
• retgersite
• timbered
• operating room
• twin law
• mesencephalon
• dub into
• countryman
• on the side
• twilight arc
• man in the cars (或street)
• can't be bad
• compliment someone into
• boused
• microglobulins
• stroud
• denationalisations
• depth zone
• optimeter
• the inevitable
• amyostasia
• webwheel
• brioche
• monarchess
• cuker
• polytone
• burros
• King Stork
• Des Moines
• asperity
• trichinopoli
• Miller-Bravais indices
• Hush up!
• expanders
• tangeloes
• in a flutter
• skin antenna
• detectable
• inacceptable
• show evidence of
• l'etoile du nord
• traditioner
• wholeheartedly
• transgressives
• metricized
• look here
• proponents
• depend on/upon a thread