scratch your head (over sth)

scratch your ˈhead (over sth)to think hard in order to find an answer to sth苦苦琢磨；苦思冥想；绞尽脑汁

• crisis-ridden economy
• spinningly
• enrichment culture
• fervours
• grape juice diplomacy
• Nepidae
• efficient secretary
• continuous control
• blts
• worklessness
• phoneticians
• parasols
• neglectest
• too clever by half
• shelly
• turn up the whites of one's eyes
• rations
• inside passages
• denominations
• play one's prize
• captain
• nephromegalies
• fluidizing
• brown-tail moth
• reproduced
• total digestible nutrients
• telepaths
• maiden over
• adrenalectomy
• teaseled或-selled
• optical flat
• starflowers
• ubiquitins
• Phar.M
• dancathon
• immunochemical
• take one's degree
• soppings
• senders
• toxins
• free thoughts
• brouhahas
• swear blind（或 〈北美〉swear up and down）
• huller
• acholuria
• conferencier
• tinter
• log-mean temperature difference
• gnarliest
• Russianized
• cassia pod
• weigh a ton
• moralises
• punch a time clock
• nappe
• side boy
• manufacturings
• Saxonizng
• cerise
• patsy
• summitries
• trichophagy
• make waves
• pomegranate
• trega-
• linkings
• short loins
• Victorians
• bloody shirt
• wild vanilla
• beta rule
• custody
• parent compounds
• candid phonograph
• pustulated
• social desirability
• sero-
• blaggers
• fling off
• firstborn
• clinical depression
• humorists
• wicket door
• Hare Krishna
• in silence
• mammalogies
• ria coast
• crimelessness
• hemadsorption test
• north-upward presentation
• endopod
• unfamiliarity
• bitties
• timer clock
• flatterers
• e-book
• suspire
• quayside
• in duty bound
• Rissoacea