つんどく (積ん読)
tadʒmiːʕ ʔalkatab llqraːʔt fiː ʔalmustaqbal tiː eɪ dʒeɪ ɛm aɪmakɹɒn letəʔiθnaːnbiːef alkjuːtʌb laɪɛlɣzkjuːaɪɑːɹeɪmakɹɒnletəʔiθnaːnbiːiːeɪeɪtʃ faɪ almʌstakbəl kəlɛktɪŋ bʊks tə ɹiːd ɪnðə fjuːtʃə ɔː ʃiraːʔ ʔalkatab wtrkahaː duːn qraːʔthaː ɛs eɪtʃ aɪ ɑːɹ eɪmakɹɒn letəʔiθnaːnbiːiː alkjuːtʌb wɑːtɑːkɪhə duːnə kjuː aɪ ɑːɹ eɪmakɹɒn letəʔiθnaːnbiːiː eɪ tiː aɪ eɪtʃ eɪmakɹɒn baɪɪŋ bʊks and liːvɪŋ ðɛm ʌnɹɛd
In Arabic تجميع الكتب للقراءة في المستقبل (tajmīʿ al-kutub li-l-qirāʾah fī al-mustaqbal - Collecting books to read in the future) or شراء الكتب وتركها دون قراءتها (shirāʾ al-kutub wa-tarkihā dūna qirāʾatihā - Buying books and leaving them unread).
The act of buying books and letting them pile up unread.
Example
"最近、つんどくが増えてきた。"
