i Register
In some senses, foe is marked as obsolete. Watch for register when choosing this word.
ADJ
bitter, dangerous, deadly, formidable, implacable, terrible
My grandfather often spoke about his bitter foe from the war years.
common
old
After years apart, the two old foes finally decided to settle their disagreement.
VERB + FOE
vanquish
The general hoped to vanquish his foes and bring peace to the troubled nation.
PREP
against a ~
The two rival companies decided to work together against a powerful foe in the market.
PHRASES
friend and foe
The charity organization accepts donations from friend and foe without judgment.
friend or foe
When the stranger arrived at the village, nobody could tell if he was friend or foe.