• sought is the past tense and past participle of seek.
• is being searched for, is wanted
• something that is much sought-after is in great demand, usually because it is rare or of very good quality.
• requested an explanation
sought him out
• ambushed him, lied in wait for him
sought medical advice
• sought a doctor's opinion
• requested sanctuary, requested shelter
• sought proper retaliation, sought compensation for the injustice he suffered
• requested sanctuary, requested refuge