What does "te-thrum" mean?
Solution 1:
In Lowry's 1928 letter to Aiken, the echoic phrase 'te-thrum' is an homage to Aiken's 1927 novel, Blue Voyage. In Blue Voyage, "te thrum" appears repeatedly in the narrator's internal monolog, as a representation of the sound of the narrator's heart in his ear. Thus, Lowry and Aiken both use "te thrum" to represent the sound of a blood pulse.
Is it my heart or is it the engine? Te thrum: te thrum.
op. cit., p. 189
Te thrum te thrum. In my left ear my heart. …
In my left ear my heart Te thrum te thrum.op. cit., p. 190