perpendicularly

US /ˌpɝː.pənˈdɪk.juː.lɚ.li/
UK /ˌpɝː.pənˈdɪk.juː.lɚ.li/
1.

vuông góc

at an angle of 90° to a horizontal line or surface:

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immense rocks rising perpendicularly from the earth