Definition of back-arc in English:

back-arc

Line breaks: back-arc

Entry from British & World English dictionary

adjective

Geology
Relating to or denoting the area behind an island arc: back-arc basin

Definition of back-arc in:

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