Chal‧len‧ger /ˈtʃæləndʒəʳ, ˈtʃælɪndʒəʳ/
a US space shuttle which exploded after TAKEOFF on one of its flights in 1986, killing all seven people inside. The terrible accident was watched on television by many people and shocked the whole of the US.

[TahlilGaran] Dictionary of Contemporary English ▲

See main entry: challenge

[TahlilGaran] Dictionary of Contemporary English ▲

challenger
noun
ADJ. closest, main, nearest, serious, strong Her nearest challenger is the vice-president.
VERB + CHALLENGER take on He took on various challengers, but refused to fight Jackson.
PREP. ~ for the main challengers for the European title
~ to a challenger to the prime minister

[TahlilGaran] Collocations Dictionary ▲