high treason

SMART Vocabulary: related words and phrases

Disloyalty, betrayal & treason
adulterous
backstabber
betrayal
betrayer
break ranksidiom
chicane
deserter
desertion
faithless
faithlessly
faithlessness
false
fifth column
sellout
stab someone in the backidiom
tergiversation
throw someone to the lionsidiom
throw someone under the busidiom
treasonable
unfaithfulness

You can also find related words, phrases, and synonyms in the topics:

Terrorism & political crime

treason | American Dictionary

treason
noun[ U ]
us/ˈtri·zən/
social studies
the crime of helping your country’s enemies or attempting to illegally remove its government:
In 1807, Burr was arrested and tried for treason, but he was acquitted.