Zhè jiā dà gōngsī shìtú bìngtūn tā de jìngzhēng duìshǒu.
The big company is trying to swallow up its rival.
Tips
usage
Strong negative connotation: implies seizing by force or absorbing greedily. Compare neutral 合并 (hébìng, 'to merge') and clinical 收购 (shōugòu, 'to acquire'). 并吞 is the right choice when you want to portray the act as predatory.
memory
并 'combine' + 吞 'swallow' — picture combining things by literally swallowing them. Pure visual.
