(1) to make an effort, try (very hard) (2) great grandfather
(3) to pawn
(4) reason
(5) old, former, late (deceased)
(6) intentional, premeditated
(7) firm, strong
(8) innate, original
(9) to look after, care for, turn one’s head ☊
cố ☊ pendulum-clock, grandfather clock ☊ đồng hồ quả lắc ☊