Definition of Mariana Trench in English:

Mariana Trench

Syllabification: Ma·ri·an·a Trench
An ocean trench to the southeast of the Mariana Islands in the western Pacific Ocean. Its greatest known ocean depth is 36,201 feet (11,034 m) at the Challenger Deep, which was discovered by HMS Challenger II in 1948.

Definition of Mariana Trench in:

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Word of the day demoralize
Pronunciation: dəˈmôrəˌlīz
verb
cause (someone) to lose confidence or hope; dispirit