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The Hubble Frontier Fields (HFF) are a selection of well-studied galaxyclusters used to probe dense environments and distant gravitationally lensedgalaxies. We explore the 21cm neutral hydrogen (HI) content of galaxies inthree of the HFF clusters, Abell 2744 ($z = 0.308$), Abell S1063 ($z = 0.346$)and Abell 370 ($z = 0.375$), to investigate the evolution of gas in galaxieswithin intermediate redshift clusters. Using Early Science MeerKATobservations, we perform spectral-line stacking with HI cubes and make a3$\sigma$ stacked detection for blue galaxies in Abell S1063 ($M_\mathrm{HI} =1.22^{+0.38}_{-0.36}\times 10^{10} \mathrm{M}_\odot$). We determine the3$\sigma$ HI mass detection limits of Abell 2744 and Abell 370 to be at theknee of the HI Mass Function. A final, more ambitious objective of this work isto search for gravitationally lensed HI emission behind these clusters, enabledby MeerKAT's wide instantaneous bandwidth. We find no evidence of highlymagnified HI emission at $0.33<z<0.58$. The low thermal noise levels achievedin these pilot observations, despite short integration times, highlights theenormous potential of future MeerKAT HI observations of dense environments andthe intermediate-redshift Universe.

HI in and behind the Hubble Frontier Field Clusters: A Deep MeerKAT Pilot Search out to $z\sim 0.5$