двуостър означава в английски

double-edged▼(a blade that is sharp on both edges)
adjective
[UK: ˌdʌb.l̩ ˈedʒd] [US: ˌdʌb.l̩ ˈedʒd]

two-edged▼(having two cutting edges)
adjective
[UK: ˈtuː edʒd] [US: ˈtuː ˈedʒd]