was trebling
Past progressive conjugation of treble. There are other translations for this conjugation.

treble

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At end April, just after the evaluation was released, the Bank said it was trebling support to the health sector this year, planning to spend $3.1 billion.
A finales de abril de 2009, justo después de la publicación de la evaluación, el Banco Mundial dijo que estaba triplicando su apoyo al sector de la salud, y que planeaba gastar $3.100 millones.
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